<!DOCTYPE html>
<html>
<head>
    <title>Border radius clipping</title>
    <link rel="author" title="zhouli" href="mailto:liz@oupeng.com">
    <style>
        #parent{
        	border-radius: 15px;
        	border: 1px solid blue;
        	overflow: hidden;
        	width: 300px;
            height: 30px;
            background-color: green;
        }
        #son{
        	width: 300px;
            height: 30px;
        }
    </style>
</head>
<body>
<div id="parent">
    <div id="son"></div>
</div>
<script>
</script>
</body>
</html>